Table 1 Descriptive statistics and univariable associations between selected animal- and herd-level factors and IBR seropositivity risk.

From: Bovine Herpes Virus Type 1 (BoHV-1) seroprevalence, risk factor and Bovine Viral Diarrhoea (BVD) co-infection analysis from Ireland

BVD	IBR-	IBR+	Total	OR	P	Upper 95%CI	Lower 95%CI
Neg	3975	1052	5027	Ref
%	79.07	20.93	100
Pos	168	78	246	1.928	0.014	1.140	3.259
%	68.29	31.71	100
Year
2018	1802	619	2421	Ref
%	74.43	25.57	100
2020	2341	511	2852	0.521	< 0.001	0.394	0.688
%	82.08	17.92	100
Age (q)
Q1	1009	294	1303	Ref
%	77	22.56	100
Q2	975	345	1320	1.537	0.009	1.116	2.118
%	73.86	26.14	100
Q3	1090	240	1330	0.811	0.226	0.579	1.138
%	81.95	18.05	100
Q4	1069	251	1320	0.905	0.575	0.638	1.284
%	80.98	19.02	100
Breed
AA	720	214	934	Ref
%	77.09	22.91	100
CH	752	192	944	0.717	0.117	0.473	1.087
%	79.66	20.34	100
FR	830	217	1,047	0.756	0.183	0.500	1.142
%	79.27	20.73	100
HE	608	184	792	0.851	0.462	0.554	1.308
%	76.77	23.23	100
LM	785	208	993	0.590	0.011	0.393	0.886
%	79.05	20.95	100
Other	448	115	563	0.663	0.083	0.416	1.056
%	79.57	20.43	100
Sex
F	1742	454	2196	Ref
%	79.33	20.67	100
M	2401	676	3077	1.386	0.017	1.059	1.815
%	78.03	21.97	100
Herd change
No change	1213	247	1460
%	83.08	16.92	100
Change	2930	883	3813	1.924	< 0.001	1.413	2.619
%	76.84	23.16	100
Movements
0	1189	242	1431	Ref
%	83.09	16.91	100
1	1619	437	2056	1.577	0.007	1.133	2.196
%	78.75	21.25	100
2	984	317	1301	2.095	< 0.001	1.462	3.001
%	75.63	24.37	100
≥ 3	351	134	485	2.950	< 0.001	1.875	4.642
%	72.37	27.63	100
Type of last herd
BEEF	1438	473	1911	1.731	0.001	1.247	2.403
%	75.25	24.75	100
DAIRY	769	203	972	1.166	0.460	0.776	1.752
%	79.12	20.88	100
OTHER	376	83	459	1.001	0.996	0.594	1.688
%	81.92	18.08	100
SUCKLER	1560	371	1931	Ref
%	80.79	19.21	100
Type of birth herd
BEEF	228	58	286	0.832	0.497	0.490	1.414
%	79.72	20.28	100
DAIRY	2248	660	2908	1.423	0.011	1.083	1.870
%	77.3	22.7	100
OTHER	184	46	230	0.902	0.731	0.501	1.624
%	80	20	100
SUCKLER	1483	366	1849	Ref
%	80.21	19.79	100
Birth herd size (median: 130; mean: 170.7)
Q1 (< 71)	1042	258	1300	Ref
%	80.15	19.85	100
Q2 (71–138)	1041	279	1320	1.199	0.280	0.863	1.666
%	78.86	21.14	100
Q3 (139–243)	1044	289	1333	1.385	0.058	0.989	1.940
%	78.32	21.68	100
Q4 (244–1920)	1016	304	1320	1.474	0.031	1.036	2.099
%	76.97	23.03	100
Last herd size (Median: 96; mean: 148.1)
Q1 (< 53)	1120	173	1293	Ref
%	86.62	13.38	100
Q2 (53–109)	1079	248	1327	1.875	0.002	1.265	2.780
%	81.31	18.69	100
Q3 (110–224)	1035	291	1326	2.321	< 0.001	1.560	3.455
%	78.05	21.95	100
Q4 (> 225)	909	418	1327	5.963	< 0.001	3.885	9.154
%	68.5	31.5	100

AA, Aberdeen angus; CH, Charolais; FR, Friesian; HE, Hereford; LM, Limousin.

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Table 1 Descriptive statistics and univariable associations between selected animal- and herd-level factors and IBR seropositivity risk.

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